In modern gear production, simple inspection systems for quick and close by measurements help to produce high quality.
The Gear RollScan method inspects all flanks of helical gears within about 1 minute.
The gear RollScan system is similar to the one-flank gear rolling inspection. The master gear, however, has measuring
tracks on selected flanks. All other areas of the master gear are clear to create a contact ratio below 1. Thus, a clear
allocation between the angle of rotation and the contact point can be made. A suitable number of teeth ratio between the
work piece and the master wheel is chosen. Every measuring track on the master wheel is chosen. Every measuring track
on the master wheel will contact every flank of the specimen after a specified number of rotations. Two master gears are
in roll contact with the specimen simultaneously. One master gear inspects all left hand flanks, the other all right hand
flanks.
The topographical measurement of all teeth requires the deployment of statistical methods for evaluating the deviations.
New parameters have to be derived, describing features of the gear which are critical for function, such as the noise
excitation, as function of the topography.
With regard to the tolerances, this measuring method has wide-ranging consequences. Whereas a standard evaluation
considers 4 teeth, with the effect that a gear ‘s worst tooth is measured more or less by coincidence, the RollScan
measuring device always will find the worst tooth

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